is it easy, or even possible without buying something expensive, to test an antminer s7 power supply. I suspect that my miner may be faulty not because of the miner itself, but rather the PSU. Every 5 minutes the miner hashes, then stops then starts again. I just got a new s7 and it has the same problem, so i think it may be the PSU. Is there a way to test just the PSU? thanks

You need to test the psu under load, not easy. Easier to beg, borrow, or steal another psu and then run with that for a while. That'll tell you if it's the psu or miner/setup.What psu are you using, btw? Is it rated high enough for an S7 (>1400W from the 12V rail)?

^^ and go to a hardware store or wherever and buy a voltmeter. Doesn't have to be expensive, just has to be digital so you can see at least 1 decimal point or more. All Ants need at LEAST 11.9vdc feeding them as measured at the PCIe plugs.

Poke the probes into the sockets alongside the wires to avoid shorting anything.

just tested it and each PCIe plug got 12.8 vdc, so i dont think that it is the PSU. any other ideas? The LED is solid red and i cannot even access the miner config page. also, after a couple minutes of being red it begins to beep every couple seconds.

With both miners you can't access the GUI page or just the 1? If you are on the right address and never connect then the controller and/or BeagleBone may be dead.

Normally I'd say ja the voltage looks good and actually much higher than expected under load. What is the voltage with no-load? Even my IBM 2kw supplies max at 12.2v no-load and drop to 12.1v measured at the plugs @ 1.3kw load. Does the miner ever start blowing hot air? If no then it is never hashing.

Query: What batch are the miners? Batches 1-5 use 54 chips and have no Vcore regulator. Voltage per-chips is PSU supply divided by number of chips. If you look in the hot end all you see are heatsinks.

Batches 6 on up all have 45 chips and a regulator. Look in the hot end and you will see an open area with the circuits.